Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa21003cb5cef5cf…

MALICIOUS

PDF

81.3 KB Created: 2021-04-18 16:25:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 36ceb33998b5f976b19f751cf11a1914 SHA-1: 18f92a6291d2071d5320eb0bc9194ba4fa6e00f7 SHA-256: aa21003cb5cef5cf379ed4c43e349dddf45a85fab2767056722c4d8ff8f973b3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://soxebez.ru/strik?utm_term=all+the+things+you+are+charlie+parker PDF link annotation
    • http://mewudaguzexo.sportsontheweb.net/estimation_and_costing_book_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460230/normal_5fdc8bb616e58.pdfIn PDF document text
    • http://liwurivosopap.medianewsonline.com/93704817121.pdfIn PDF document text
    • http://kayikciakademi.com/vawefurahio47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387229/normal_606b969b945a4.pdfIn PDF document text
    • http://storeeuro.info/ruzazupofabodosujosubovennfpo6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368984/normal_6051fd228e2f2.pdfIn PDF document text
    • http://katopikinu.22web.org/cambridge_international_examinations.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://seninode.epizy.com/small_scale_business_management_system.pdfIn PDF document text
    • http://kiwajuku.epizy.com/workbook._save_as_c.pdfIn PDF document text
    • http://vidugozu.atwebpages.com/symbolism_in_the_great_gatsby.pdfIn PDF document text
    • http://galexuduxegi.epizy.com/alimentos_ricos_en_hierro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/932bc7db-2828-41f3-84e6-91eb15252139/sumathi_satakam_poems_in_telugu_with_pictures.pdfIn PDF document text
    • http://jifisuxevizek.myartsonline.com/vumerikawumugoxa.pdfIn PDF document text
    • http://tuxefunuzire.atwebpages.com/curso_de_caldeiraria_em.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abe78651-c72d-4483-b1d9-ada52e0e0bf2/how_to_make_logitech_k400r_discoverable.pdfIn PDF document text
    • http://kuzebelinebofe.epizy.com/acero_aisi_4140.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4A 5352 bytes
SHA-256: 9b04a63bb55948b8b209c367600fdba91b8341089ad378a480c5f10e28acd4c3
font_01_sfnt_off00011187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11187 10944 bytes
SHA-256: a9929c3f80ff4e00c09911508eba0f64ab2f405c74439084e45f7ec4866cdc1a

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